• The pump brings water from an outside, below ground cistern into a house.
  • The system as a whole performs normally.
  • We have checked repeatedly for dripping taps and leaks.
  • The pump can cycle during the evening or in the night when no-one is drawing water for any purpose.
  • The pump does not run long, we estimate from half a minute to a minute.

This often wakes my wife which is bad enough. Is it a sign of impending doom?

  • 1
    Have you considered the check valve that prevents backflow to the cistern might be where the leak is? Pressure is evidently going somewhere. I’ve seen a stethoscope used for a quick check. – Tyson Apr 9 '18 at 21:50
  • @Tyson: No, that would not have occurred to me. Thanks. I will try to check it. Mind you I don't have a stethoscope. – Bill Bell Apr 9 '18 at 21:57
  • 1
    It does sound like the backflow checkvalve (or foot valve in the cistern) to me. If you have a pressure gauge near the pump/pressure tank you can diagnose this by shutting off the main valve to the house and watching it -- if it goes down, water is leaving the tank from somewhere, and absent a visible leak it pretty much has to be the check valve. – gregmac Apr 9 '18 at 22:28

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